Double bar's in alpaca market feed

any reason i sometimes see 2 bars when i grab bars using “https://data.alpaca.markets/v2/stocks/SPY/bars” ?

{“t”:“2022-12-12T18:25:00Z”,“S”:“SPY”,“o”:395.32,“h”:395.41,“l”:395.26,“c”:395.38,“v”:398635.0,“n”:554.0,“vw”:395.521418} {“t”:“2022-12-12T18:25:00Z”,“S”:“SPY”,“o”:395.29,“h”:395.36,“l”:395.29,“c”:395.36,“v”:395.0,“n”:9.0,“vw”:395.314101}

if you do it for that day or any day really, youll see 2 bars now and then, diff values too. this messes up algos.